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02: A sphere of diameter 10 mm, is initially in equilibrium at 672 K in a furnace. It is suddenly removed from the furnace and subjected to a two-step cooling process: 1-Cooling in air at 292 K for a period of (t) until the temperature reaches 607 K, hem, 10 W/m².K. 2-Cooling in water at 292 K₂ h. -1000 W/m².K, Q-3000 kg/m' k-20 W/m.K. C-1000 J/kg.K, a -6.66x10 m/s. Calculate the time t, required for cooling by air and the time t, required for cooling by water to cool the sphere from 672 K to 322 K. Given q,-0.95 e A (T-T;), a-5.69x10 W/m².K.

02: A sphere of diameter 10 mm, is initially in equilibrium at 672 K in a furnace. It is suddenly removed from the furnace and subjected to a two-step cooling process: 1-Cooling in air at 292 K for a period of (t) until the temperature reaches 607 K, hem, 10 W/m².K. 2-Cooling in water at 292 K₂ h. -1000 W/m².K, Q-3000 kg/m' k-20 W/m.K. C-1000 J/kg.K, a -6.66x10 m/s. Calculate the time t, required for cooling by air and the time t, required for cooling by water to cool the sphere from 672 K to 322 K. Given q,-0.95 e A (T-T;), a-5.69x10 W/m².K.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Q2: A sphere of diameter 10 mm, is initially in equilibrium at 672 K in a furnace. It is suddenly removed from the furnace and subjected to a two-step cooling process: 1-Cooling in air at 292 K for a period of (t) until the temperature reaches 607 K, hes, 10 W/m².K. 2-Cooling in water at 292 K, h-1000 W/m².K, 0-3000 kg/m³ k-20 W/m.K. C, 1000 J/kg.K, a -6.66x10 m/s. Calculate the time t, required for cooling by air and the time t, required for cooling by water to cool the sphere from 672 K to 322 K. Given q,-0.95 A (T-T), -5.69x10* W/m².K.
Transcribed Image Text:Q2: A sphere of diameter 10 mm, is initially in equilibrium at 672 K in a furnace. It is suddenly removed from the furnace and subjected to a two-step cooling process: 1-Cooling in air at 292 K for a period of (t) until the temperature reaches 607 K, hes, 10 W/m².K. 2-Cooling in water at 292 K, h-1000 W/m².K, 0-3000 kg/m³ k-20 W/m.K. C, 1000 J/kg.K, a -6.66x10 m/s. Calculate the time t, required for cooling by air and the time t, required for cooling by water to cool the sphere from 672 K to 322 K. Given q,-0.95 A (T-T), -5.69x10* W/m².K.
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